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- W2890130621 abstract "Melanosome dispersion is important for protecting the internal organs of fish against ultraviolet light, especially in transparent larvae with underdeveloped skin. Melanosome dispersion leads to dark skin color in dim light. Melanosome aggregation, on the other hand, leads to pale skin color in bright light. Both of these mechanisms are therefore useful for camouflage. In this study, we investigated a hormone thought to be responsible for the light wavelength-dependent response of melanophores in zebrafish larvae. We irradiated larvae using light-emitting diode (LED) lights with peak wavelengths (λmax) of 355, 400, 476, 530, and 590 nm or fluorescent light (FL) 1–4 days post fertilization (dpf). Melanosomes in skin melanophores were more dispersed under short wavelength light (λmax ≤ 400 nm) than under FL. Conversely, melanosomes were more aggregated under mid–long wavelength light (λmax ≥ 476 nm) than under FL. In addition, long-term (1–12 dpf) irradiation of 400 nm light increased melanophores in the skin, whereas that of 530 nm light decreased them. In teleosts, melanin-concentrating hormone (MCH) aggregates melanosomes within chromatophores, whereas melanocyte-stimulating hormone, derived from proopiomelanocortin (POMC), disperses melanosomes. The expression of a gene for MCH was down-regulated by short wavelength light but up-regulated by mid–long wavelength light, whereas a gene for POMC was up-regulated under short wavelength light. Melanosomes in larvae (4 dpf) exposed to a black background aggregated when immersing the larvae in MCH solution. Yohimbine, an α2-adrenergic receptor antagonist, attenuated adrenaline-dependent aggregation in larvae exposed to a black background but did not induce melanosome dispersion in larvae exposed to a white background. These results suggest that MCH plays a key role in the light wavelength-dependent response of melanophores, flexibly mediating the transmission of light wavelength information between photoreceptors and melanophores." @default.
- W2890130621 created "2018-09-27" @default.
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- W2890130621 date "2018-12-01" @default.
- W2890130621 modified "2023-10-17" @default.
- W2890130621 title "Melanin-concentrating hormone is a major substance mediating light wavelength-dependent skin color change in larval zebrafish" @default.
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- W2890130621 doi "https://doi.org/10.1016/j.ygcen.2018.09.006" @default.
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